>> reporter: caught with a meat cleaver. 28-year-old min gone hong, sliced his wife with a meat cleaver. >> it was very scary. yes, i saw everything. >> reporter: joanne fong watched the bloody crime unfold sunday, at 10:30 a.m., in front of her business, fong's trading company. >> right in front of my face. >> reporter: where the attack happened right here may have saved the victim's life. look across canal street. it's the chinatown fire department unit. and those outside heard the screams and came rushing out. >> he pulled the cleaver out of his waistband and started hacking at this woman. >> reporter: jose ortiz and another firefighter, seen here on surveillance video, pouncing on wong, though subduing him was not easy. >> i rushed him. i am trying to grab the cleaver, but he's swinging. i would guess 6, 8, maybe 10 times. he pit the woman in the head. >> reporter: as they pinned wong down, the victim took off running into a restaurant. and so did firefighter shane clark, who followed her with a portable medical kit.